SKF7209 ACD/P4ADGBAngular Contact Ball Bearing — Super-Precision P4A Matched Pair, 45 mm ID, 85 mm OD, 19 mm Width, 25° Contact Angle, Light Preload 520 N

Product Description

What this part is:

SKF 7209 ACD/P4ADGB is a matched set of two super-precision, high-capacity D design, single row angular contact ball bearings, universally matchable, supplied at medium preload. Unit Quantity: 2 Pcs.

Decoding the designation:

7209 — ISO 72 light dimension series, bore code 09, giving a 45 x 85 x 19 mm envelope per bearing.

ACD — high-capacity D design ground to a 25° contact angle.

P4A — SKF super-precision tolerance class P4A, ABEC 7 running accuracy.

DGB — universally matchable set of two bearings, medium preload, 520 N.

Specifications:

Bore Diameter: 45 mm. Outside Diameter: 85 mm. Overall Width: 19 mm per bearing. Total Width: 38 mm across the matched pair. Contact Angle: 25°. Preload: Medium, 520 N. Axial stiffness: 190 N/µm. Precision Class: ABEC 7 / P4A. Dynamic Load Rating: 66,300 N for the set of two. Static Load Rating: 60,000 N for the set of two. Fatigue load limit: 2,500 N. Limiting Speed: 15,000 rpm on grease and 24,000 rpm on oil-air for a single bearing, before the arrangement speed reduction factor. Ball diameter: 12.7 mm. Number of balls per bearing: 14. Reference grease quantity: 5.9 cm³ per bearing. Rolling Elements: Ball. Number Of Rows: 1 per bearing. Bore Type: Straight. Seal Type: Open. Bearing Material: Bearing steel. Cage Type: outer-ring shoulder-guided. Lubricant: none, supplied ungreased.

Speed reduction factors for the 72 D series at this preload: 0.75 back-to-back, 0.72 face-to-face, 0.9 for a spring-loaded DT tandem set. Calculation factor e: 0.68. Single and tandem: X1 1, X2 0.41, X0 0.5, Y1 0, Y2 0.87, Y0 0.38. Back-to-back and face-to-face: X1 1, X2 0.67, X0 1, Y1 0.92, Y2 1.4, Y0 0.76.

Dimensions and mounting:

Mounting Arrangement: universally matchable, back-to-back (DB), face-to-face (DF) or tandem (DT). Shoulder diameter of inner ring: 57.3 mm on both side faces. Shoulder diameter of outer ring, large side face: 72.7 mm. Chamfer dimension r1,2: 1.1 mm minimum. Chamfer dimension r3,4: 0.6 mm minimum. Shaft abutment diameter da and db: 52 mm minimum. Housing abutment diameter Da: 78 mm maximum. Housing abutment diameter Db: 80.8 mm maximum. Fillet radius ra: 1 mm maximum. Fillet radius rb: 0.6 mm maximum. Oil nozzle position dn: 60.6 mm.

Compatibility and replacement:

Cross-references for 45 x 85 x 19 mm 25° super-precision executions at medium preload: FAG B7209-E-T-P4S-UM, NSK 7209A5TYNDUMP4, RHP 7209A5TDUMP4.

Frequently asked questions:

What are the dimensions of the SKF 7209 ACD/P4ADGB?

Each bearing is 45 mm bore, 85 mm outside diameter and 19 mm wide. The matched pair stacks to 38 mm.

What contact angle and precision class does it have?

The ACD design has a 25° contact angle. The precision class is P4A, ABEC 7.

How many bearings are in the set and what is the preload?

Two universally matchable bearings at medium preload, 520 N, arranged back-to-back, face-to-face or tandem.